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ID number:941036
 
Author:
Evaluation:
Published: 10.11.2010.
Language: Latvian
Level: Secondary school
Literature: 3 units
References: Not used
Extract

Paraugs Daugavas upes labais krasts Ķengaragā, smelts no 15 cm dziļuma, plkst. 15:15
Datums : 11.09.2010.

Reakcijas vienādojumi
Aprēķinot ūdenī izšķīdušo vielu oksidējamību, izmanto stehiometriskās sakarības starp organisko vielu oksidēšanai nepieciešamo skābekļa daudzumu (molos) un cita oksidētāja daudzumu.

5O2 + 20H3O+ + 3e-→30H2O
4MnO4- + 32 H3O+ + 20e-→4Mn2+ +30H2O

Tātad 5 moli skābekļa var oksidēt tādu pašu daudzumu reducētājā kā 4 moli permanganātjoni.
Analīzi nobeidz, skābeņskābes pārākumu attitrējot ar permanganāta šķīdumu.…

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